Where can I find free public domain images and pictures?

Today,
there are dozens of great Internet web pages that offer hundreds of
thousands of free public domain and royalty free images. Below is a
list of some of the best available sites to find these pictures.

Note: All of these sites have
free images with different agreements. Make sure the images you're
copying have no restrictions or have license agreements that allow you
to use them in the way you want to.

Free Images

http://www.freeimages.com/
Formerly Stock Exchange Free Images is one of the best site to locate free stock photo's. The site
contains in our opinion the best site to locate free stock photo's.
The site contains thousands of free images that can be used. While many
of the pictures are free some of the images do require written permission
first.

Google Images with usage rights

http://images.google.com/
Doing a search on Google Image search is a great way to find lots of
interesting pictures, but it used to be very time consuming to find
what pictures you could use legally on your site. Thankfully Google
now has an option to search images by usage rights. As seen below, under
the Search tools (1.) and then Usage Rights (2.) are options to filter
the search by pictures labeled for reuse, labeled for commercial reuse,
labeled for reuse with modification, and labeled for commercial reuse
with modification.

Flickr: The Commons

http://flickr.com/commons
A great feature from the popular photo sharing site Flickr where institutes
such as The Library Of Congress, Powerhouse Museum, Brooklyn Museum,
Smithsonian Institution, and various users can post and share images
that have no known copyright restrictions.

Microsoft Office free images and clipart

MorgueFile

http://www.morguefile.com/
Another fantastic location to locate high resolution digital stock photography.
The site offers thousands of free images almost all that have no restrictions
or agreements attached. In addition the site requires no login to download
the high quality files.

Picdrome

PD Photo

http://pdphoto.org/
Another great collection of thousands free public domain pictures. This
site contains one of the best collections of travel pictures from around
the world.

Pixabay

http://www.pixabay.com/
Simple, easy to use site with nearly 65,000 photos and illustrations. All of which may be used freely, without attribution and for any purpose.

Liam's pictures from Old Books

http://www.fromoldbooks.org/
A good collection of original pictures from old books that are no longer
copyrighted and considered public domain. This is a great place to find
obscure and unique pictures and illustration.

WorldImages

http://worldart.sjsu.edu
California State University product that contains over 60,000 images
around the world that can be used freely for non-profit and education
use.

deviantART

http://www.deviantart.com/
Another fantastic site with not only photographs, but traditional art,
digital art, stock images, and more. Keep in mind that this site contains
both royalty free and copyrighted works. Make sure you view the artists
or photographers usage guidelines and rules before using any image.

Other

The above list is just a few of our favorites sites and
sites we found useful for locating free public domain images. If the
above links do not have the images you're looking for there are
hundreds of other available services online. Click here to open a search for hundreds.